Galaxies move away from us in all directions because:
A) the force of gravity increases with distance
B) the force of gravity weakens with distance
C) space is expanding
D) our galaxy has expelled all other galaxies
E) we are at the center of the expansion of the universe

Question

Quizplus · Accepted Answer

The most accepted theory for the observed expansion of galaxies is that space itself is expanding, causing the distances between galaxies to increase. This theory is supported by observations such as cosmic microwave background radiation and redshift. Answers A, B, and D are incorrect because they do not explain the observed phenomenon of galaxies moving away from us in all directions, and answer E is incorrect because there is no evidence to support the idea that we are at the center of the expansion of the universe.

Galaxies Move Away from Us in All Directions Because